fix: handle empty callback base URLs better

program/management/commands/initialize.py

@@ -11,14 +11,13 @@ class Command(BaseCommand):
         AURA_PROTO = os.getenv("AURA_PROTO")
         AURA_HOST = os.getenv("AURA_HOST")
 
-        TANK_CALLBACK_BASE_URL = os.getenv(
-            "TANK_CALLBACK_BASE_URL",
-            default=f"{AURA_PROTO}://{AURA_HOST}/tank",
-        )
-        DASHBOARD_CALLBACK_BASE_URL = os.getenv(
-            "DASHBOARD_CALLBACK_BASE_URL",
-            default=f"{AURA_PROTO}://${AURA_HOST}",
-        )
+        TANK_CALLBACK_BASE_URL = os.getenv("TANK_CALLBACK_BASE_URL")
+        if TANK_CALLBACK_BASE_URL == "":
+            TANK_CALLBACK_BASE_URL = f"{AURA_PROTO}://{AURA_HOST}/tank"
+
+        DASHBOARD_CALLBACK_BASE_URL = os.getenv("DASHBOARD_CALLBACK_BASE_URL")
+        if DASHBOARD_CALLBACK_BASE_URL == "":
+            DASHBOARD_CALLBACK_BASE_URL = f"{AURA_PROTO}://{AURA_HOST}"
 
         call_command("migrate", "--no-input")